This is a tire pressure reset tool designed to assist in the sensor relearn procedure. After each tire rotation, or when replacing tires, the body control module, or tire pressure sensors, the relearn process must be performed to ensure accurate tire pressure readings and proper display.Operation steps: 1. Ensure the vehicle is in TPMS learning state/mode. 2. Following the vehicle manufacturers instructions, use the tool sequentially (front left, front right, rear right, rear left) by positioning it near the tire sidewall close to the valve stem and press the reset button. 3. The green LED (TX light) will illuminate, indicating signal transmission. When the vehicle horn sounds, the matching is complete. 4. Repeat the process for the remaining tires.Specifications: - Compact and portable design - Enables real-time tire pressure monitoring system activation - Compatible with most vehicles equipped with TPMS - Supports diagnostic sensing function - For GM vehicles with 315 MHz or 433 MHz Tire Pressure Monitoring (TPM) systems, the sensor relearn procedure is required after tire rotation, remote keyless entry receiver module replacement, or tire pressure sensor replacement. This procedure can be completed using compatible tools and applies to 2014 and earlier GM models. Note: Only specific OEM-level diagnostic tools can read tire pressure sensor data on 2012 and later model year vehicles.Package Included: 1 x Tire pressure reset instrument